Portion of an eyeglass frame



FIG. 1 is a front view of our new design, with the dashed portions showing environment that is not part of the claimed design;

FIG. 2 is a rear view of the design of FIG. 1, with the dashed portions showing environment that is not part of the claimed design;

FIG. 3 is a left side view of the design of FIG. 1;

FIG. 4 is a right side view of the design of FIG. 1;

FIG. 5 is a top plan view of the design of FIG. 1;

FIG. 6 is the bottom plan view of the design of FIG. 1; and,

FIG. 7 is a perspective view of the design of FIG. 1. 

The ornamental design for the portion of an eyeglass frame, as shown and described. 